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From "Henry Robinson (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (ZOOKEEPER-704) GSoC 2010: Read-Only Mode
Date Wed, 02 Jun 2010 16:32:37 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Henry Robinson reassigned ZOOKEEPER-704:
----------------------------------------

    Assignee: Sergey Doroshenko

> GSoC 2010: Read-Only Mode
> -------------------------
>
>                 Key: ZOOKEEPER-704
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-704
>             Project: Zookeeper
>          Issue Type: Wish
>            Reporter: Henry Robinson
>            Assignee: Sergey Doroshenko
>
> Read-only mode
> Possible Mentor
> Henry Robinson (henry at apache dot org)
> Requirements
> Java and TCP/IP networking
> Description
> When a ZooKeeper server loses contact with over half of the other servers in an ensemble
('loses a quorum'), it stops responding to client requests because it cannot guarantee that
writes will get processed correctly. For some applications, it would be beneficial if a server
still responded to read requests when the quorum is lost, but caused an error condition when
a write request was attempted.
> This project would implement a 'read-only' mode for ZooKeeper servers (maybe only for
Observers) that allowed read requests to be served as long as the client can contact a server.
> This is a great project for getting really hands-on with the internals of ZooKeeper -
you must be comfortable with Java and networking otherwise you'll have a hard time coming
up to speed.

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